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• Cambridge University Engineering Department Publications Database (2)
• Digital Archives@Colby (1)
• Digital Commons @ Winthrop University (1)
• Digital Commons at Florida International University (3)
• DigitalCommons@University of Nebraska - Lincoln (3)
• Harvard University (4)
• Ministerio de Cultura, Spain (1)
• Portal de Revistas Científicas Complutenses - Espanha (3)
• Publishing Network for Geoscientific & Environmental Data (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (1)
• Queensland University of Technology - ePrints Archive (5)
• Universidad del Rosario, Colombia (4)
• University of Michigan (150)
• WestminsterResearch - UK (1)